From Chapter 3 of Rachel Carson's seminal book, Silent Spring (1962):
FOR THE FIRST TIME in the history of the world, every human being is now subjected to contact with dangerous chemicals, from the moment of conception until death. In the less than two decades of their use, the synthetic pesticides have been so thoroughly distributed throughout the animate and inanimate world that they occur virtually everywhere. They have been recovered from most of the major river systems and even from streams of groundwater flowing unseen through the earth. Residues of these chemicals linger in soil to which they may have been applied a dozen years before. They have entered and lodged in the bodies of fish, birds, reptiles, and domestic and wild animals so universally that scientists carrying on animal experiments find it almost impossible to locate subjects free from such contamination. They have been found in fish in remote mountain lakes, in earthworms burrowing in soil, in the eggs of birds—and in man himself.
So, is it almost impossible for scientists to find animals that are not contaminated by chemicals? (By chemicals, Carson generally means insecticides and pesticides.) Has the natural ecological cycle spread synthetic chemicals to all corners of the planet?
Carson also goes on to say that:
They occur in the mother’s milk, and probably in the tissues of the unborn child.
Is there evidence to suggest that breast milk is also now similarly contaminated? In most women around the world?